eschwei



No. 620,759. Patented Mar. 7, I899. C. ESCHWEI.

ELECTRIC ARC LAMP.

{Application fl1ed.]?eb. 8, 898-) (No Model.) 2 SheetsShaet l.

A AF WITNESSES INVENTOH m: NORRIS PETERS co. FHOTO-LIYHO, WASHINGTON, n. c.

No. 620,759.. Patented Mar. 7, I899.

C. ES'CHWEI.

ELECTRIC ARC LAMP.

(Application filed Feb. 3, 1898.)

(No Model.)

2 Sheets-Sheet 2.

W/ TNE SSE 8 /N VENTO/i 3 B W M 17' 1 Arrow UNITED STATES PATENT OFFICE.

CHARLES ESCl-IWEI, OF NEXV YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 620,759, dated March '7, 1899.

Application filed February 3, 1898. Serial No. 668,941. (N model.)

To all whom, it may concern.-

Be it known that I, OHAELEs EscHwEI, a citizen of the United States, residing at New York, (Long Island City,) in the county of Queens and State of New York, have in vented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

The invention relates to certain improvements in electric-arc lamps of that class in which the upper carbon is fed by gravity, so as to form the are by the action of a solenoid or magnetic core, Which is connected by intermediate mechanism with a clutch that engages or releases the upper carbon under the influence of the varying resistance of the are on the solenoid; and the invention consists of an electric-arc lamp which comprises a solenoid, a magnetic core in the same, an upper carbon guided by a cross-piece supported on the stationary rods of the lamp-frame, a

flange at the lower end of the core, a clutch device connected at one side of its circumference by a suspension-rod with the flange on the core, while its opposite side rests on the top plate of an arc-inclosing globe, and a lower carbon supported by an auxiliary frame suspended from the top of the globe.

The invention consists, further, of certain details of construction and combinations of parts to be fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a front elevation of my improved electric-arc lamp for multiple-are circuits. Fig. 1 is a vertical section on line 1 1, Fig. 1. Fig. 2 is a side elevation of the same. Figs. 3 and 4t are vertical transverse sections drawn on a larger scale and showing my improved clutch for engaging the upper carbon, respectively, in the act of engaging and in the act of releasing the carbon. Fig. 5 is a horizontal section drawn on line 5 5, Fig. 2, on a larger scale; and Fig. 6 is a horizontal section on line 6 6, Fig. 4, showing the clutch device in plan view.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents a solenoid which is attached to a top plate B, which is provided with means for suspending the entire lamp in a suitable manner. The top plate Bis provided with binding-posts b I), respectively, for the incoming and outgoing current,-and with downwardly-extending posts 0, that extend some distance below the solenoid A and which carry at their lower ends a second plate B, which corresponds in shape and size to the top plate B. To the plate B are attached two parallel suspending-rods D, which extend in downward direction and carry at their lower ends a circular top plate D, which is provided with a central opening, through which the upper carbon E is passed in downward direction. The upper end of the upper carbon Eis extended through an opening in the sliding cross-piece E and rigidly clamped to the same by a thumb-screw e, which firmly holds the upper carbon in position on the cross-piece E. The cross-piece E slides freely through the means of openings on the suspension-rods D D, the said cross-piece E being separated from said suspension-rods by suitable insulating material interposed in the side walls of the guide-openings, as shown clearly in Fig. 5. To the circumferential flange of the top plate D of the lamp proper are attachedtwo downwardlyextending rods D which carry at their lower ends an oblong plate D which is recessed for receiving a socket cl for the lower carbon E said lowercarbon being secured in the socket d by means of a clamping-screw e The carbon-holding socket 61 also serves for supporting a globe G, the upper end of which is supported by a ring-shaped plate g, that is secured by screw-bolts g to the circumferential flange of the top plate D, as shown clearly in Figs. 1 and 2. The globe serves to exclude the air from the are, while the annular space formed by the central openingin the top plateDaround the upper carbonEserves as a gas-check for permitting the escape of the products of combustion. The lower part of the socket d is screw-threaded and clamped by an interiorly-threaded nut D to the under side of the recessed plate D so as to hold thereby the socket, lower carbon, and globe G firmly in position. The lower end of the socket d is furthermore held by a screw-cap d, which when detached permits the insertion of a new carbon and also makes the socket cl air-tight, so as to prevent the ingress of cold air into the globe G. This screw-cap d has to be unscrewed to remove the socket d from the plate D when it is desired to remove and clean the globe G. The upper carbon is readily inserted by removing the unburned portion of the same and removing the clampingscrew 6 and inserting a new upper carbon through the cross-piece and through the top plate D and clamping the upper end of the carbon to the cross-piece by the clampingserew e.

The feeding of the upper carbon toward the lower carbon is accomplished by a clutch H, which is arranged above the top plate D of the globe G, said clutch resting with one end on said top plate, while its opposite end is pivoted to a connecting-rod H, which passes through the plate B and is adj ustably screwed to a circumferential flange h at the lower end of the magnetic core A, that extends into the central opening of the solenoid A. By adjustably screwing the rod H into the plate B of the core A the movement of the said rod may be limited in abutting at its upper end against the solenoid, while by the air-cushion formed in the solenoid the said rod is caused to slowly stop before striking the solenoid. The clutch is provided with an opening 0, that flares at the lower part and is made cylindrical at its upper part, as shown clearly in the detail Figs. 3 and 4, said cylindrical portion exerting a wedge-like or binding action on the carbon when the same is to be lifted by the clutch and serving to release the carbon when the clutch H is moved in downward and horizontal posit-ion by the rod H, as shown in Fig. at. In the latter case the upper carbon is permitted to slide in a downward direction, while it is raised when the clutch engages the upper carbon so as to move it in upward direction. As soon as the magnetic core A is sucked in by the influence of the current passing through the solenoid A the clutch is likewise raised by the connection of the circular flange 71 with the clutch by the rod H, so that the clutch II grips the upper carbon firmly and raises it together with the cross-piece E, which latter slides on the suspension-rods D. As soon as the current in the solenoid is diminished the magnetic core begins to slide down slowly, which motion is transmitted by the connecting-rod II to the clutch H, whereby the same is lowered sufficiently to release the upper carbon, so that the same is free to slide down under the influence of gravity until arrested again by the action of the solenoid A on its core A due to the increased current passing through the solenoid.

The increasing and decreasing resistance produced by the larger or smaller size of the are between the carbons and the consequent decreasing and increasing of the current passing through the coil of the solenoid produces the alternating raising and lowering of the magnetic core together with the connectingrod and clutch, and thereby the alternating clutching and liberating of the upper carbon, so that the perfect regulation of the size of the are is obtained by the quick act-ion of the solenoid and the clutch mechanism operated thereby.

The current is conducted from the line-wire to the insulated binding-post b, from the same through the solenoid and through the coil of the same by wire b to the cross-piece E, from the latter to the upper carbon, then through the lower carbon and its socket along the rods D and top plate D, and rods E, plate B, and posts 0 to the binding-post Z), and then to the outgoing line-wire.

The lamp-frame may be suitably incased above the globe, if desired, and a reflectorshade arranged around the globe so as to throw the light in downward direction, as shown in dotted lines in Fig. 1.

Having thus described my invention, what I claim is- 1. In an electric-arc lamp, the combination of a solenoid, a magnetic core in said solenoid having a circumferential flange at its lower end, a lamp-frame with parallel suspensionrods, a cross-piece sliding on said rods and being insulated therefrom, an upper carbon attached to said cross-piece, a plate at the lower end of the suspension-rods, a clutch provided with a tapering opening and resting at one side on said top plate, and a connecting-rod pivoted at one side of the clutch and connected at its upper end with the circumferential flange of the solenoid-core, substantially as set forth.

2. In an electric-arc lamp, the combination of a solenoid, a magnetic core in said solenoid, provided with a circumferential flange, a supporting-plate below the solenoid, posts connecting said supporting-plate with the top plate of the solenoid, suspension-rods extending in downward direction from the supporting-plate, a cross-piece sliding on said suspension-rods and insulated therefrom, an upper carbon attached to said cross-piece and extending in downward direction, a top plate having a central opening, a globe extending around the arc and suspended from said top plate, a support for the lower end of the globe, a lower carbon supported in the supporting device of the globe, a clutch resting at one end on the top plate of the globe, and a connecting-rod pivoted to the clutch and attached to the circumferential flange of the magnetic core of the solenoid, substantially as set forth.

3. In an electric-are lamp, the combination of a clutch for the upper carbon, a solenoid having a core provided with a flange, and a connecting-rod extending from the clutch and screwed into the said flange so that the upper end of said rod is adapted to strike against the solenoid, such screw connection between the rod and said flange permitting the adj ustment of the rod in the flange, substantiallyas set forth.

In testimony that I claim the foregoing as myinvention I have signed my name in presence of two subscribing witnesses.

CHAS. ESCIIWEI.

Witnesses:

PAUL GonPEL, MAX H. WURTZEL. 

